Recent Patents on Mechanical Engineering - Online First

In phase change thermal management systems, the development of magnetic phase change materials offers the possibility of effectively integrating passive and active heat control technologies..The low dispersibility of traditional heat transfer additives, the high interfacial thermal resistance with phase change matrices, and the restricted magnetic response characteristics are some of the current problems that must be resolved.

To overcome these challenges, this study employed a co-precipitation method to composite magnetic nanoparticles Fe3O4 with graphene oxide (GO). The active sites on GO were functionalized with alkyl groups to prepare Fe3O4-modified graphene oxide (Fe3O4-MGO)/paraffin magnetic composite phase change materials. The morphology, structure, chemical composition, and thermal properties of the resulting magnetic composite phase change materials were tested and characterized.

The results indicated that Fe3O4-MGO exhibits good dispersibility in paraffin, which can enhance the thermal conductivity of the phase change material. The thermal conductivity of the composite phase change material with a Fe3O4-MGO mass fraction of 2.0% was measured to be 0.461 W/m·K, representing a 47.3% increase compared to pure paraffin. Additionally, Fe3O4-MGO demonstrated a certain phase change capability, with a phase change enthalpy reaching 70.35 kJ/kg.

The findings of this study are expected to provide technical support for innovative applications of magnetic-controlled phase change thermal management.

As one of the essential pieces of chemical equipment, a reactor provides the necessary reaction space and conditions for the materials involved in the reaction during the stirring process. However, under typical operating conditions, issues such as uneven gas distribution, suboptimal gas-liquid mixing, and low product yield often arise in gas-liquid phase reactors.

To address the issues prevalent in current stirred reactors, a new design for a stirred reactor equipped with a double-suction turbine agitator was developed.

In this paper, a stirred reactor equipped with a double-suction turbine agitator was designed, and its three-dimensional modeling was conducted using SolidWorks. Computational Fluid Dynamics (CFD) simulations, based on the Euler-Euler two-phase approach with the RNG k − ε turbulence model, were performed to assess variables such as stirring speed, installation height, blade diameter and agitator inner diameter. The dispersion characteristics and flow field behaviors of the gas-liquid two-phase under varying conditions were comparatively analyzed. Optimizations were conducted across various parameters to enhance the gas mixing efficiency in the liquid phase.

The results show that a diameter of 370mm for the double-suction turbine agitator, an installation height of 640mm, a blade diameter of 500mm, and an inner hole diameter of 200mm yield optimal gas-liquid two-phase mixing performance. This configuration results in a broad and uniform gas distribution within the reactor, maintaining a desired high level of gas holdup at specific positions.

The double suction turbine agitator is a type of radial agitator. During operation, it induces significant centrifugal forces in the liquid, exerts a robust shear effect, and enhances the mixing of the gas-liquid phases, thereby increasing the production efficiency of the product.

The expanding need for fossil fuels emphasizes the necessity to comprehend renewable energy sources.

This study examined the performance of a single-cylinder diesel engine using Jatropha biodiesel and aluminum dioxide the research aimed to evaluate engine reactivity to compression ratio and load variations. The experiment employed with varitaion compression ratios

This study used the Response Surface Methodology to find the best Brake Specific Fuel Consumption performance indicator location. The researchers used a Central Composite Design setup for analysis. A regression model employing the response surface approach was then created to predict fuel phase-out likelihood

This study examines multiple factors' effect and highlights the potential for patentable innovations in renewable fuel applications. According to studies. Jatropha biodiesel and its blends may improve engine efficiency and lower brake-specific fuel consumption compared to diesel fuel. Minor input parameter modifications are needed to gain these benefits.

This research aims to mitigate defects in the turning operation of thrust plates used in fighter jet fuel tank assemblies, thereby reducing the rejection rate and improving overall quality. This aligns with the aerospace industry's reliability goals.

The thrust plate is a critical component in fighter jet fuel tank assembly, transmitting engine thrust to the airframe. Quality compromises in this component can impair jet performance. It was observed that the thrust plate had a rejection rate of about 2.9% due to various defects. This real-world scenario underscores the importance of our study on the thrust plate and its potential impact on the aerospace industry. The rejection rate underscores its significance and potential for patent by quality improvement in turning of the thrust plate.

The objective is to mitigate turning operation defects on the thrust plate to reduce rejection rates, aligning with aerospace industry reliability goals.

Experimentation encompassed four pivotal factors: turning speed, feed rate, cutting depth, and tool inserts, implemented through Taguchi's Orthogonal Array technique. Grey Relational Analysis was utilized to optimize parameters in thrust plate turning. Specifically, this paper targeted the enhancement of its diameter, surface roughness, and tool life.

A single coefficient for the multiple responses, i.e., grey relational grade, has been determined, and optimum levels for the parameters have been identified. Confirmation experiments with the optimal factor level combination were carried out on a sample of thrust plates, and no rejections were observed.

An experimental design based on Taguchi’s orthogonal array approach was used to conduct the experiments. The Grey Relational Analysis has been applied to analyze the experimental results and optimize the turning operation process parameters for the responses thrust plate diameter, tool life, and surface roughness. With this, the rejection of the thrust plate has been considerably reduced.

This research paper examines the mechanical and wear properties of aluminium-based cast composites, an exciting category of materials with many different uses. The study aspires to understand more about the effectiveness of these composites under various conditions and weights.

This investigation aims to identify the microstructural constituents that influence resistance to wear and mechanical strength. The outcomes will provide fascinating knowledge regarding possible applications of these composites in the field, notably manufacturing, aeroplanes, and shipping, whereby lightweight materials with superior strength and resistance to wear are extensively demanded. Whenever utilized, these reinforcements act like bearing structures that prevent cracks. Aluminium lacks the characteristics needed for a wide range of engineering applications.

As a result, it is critical to produce aluminium-based alloys with all of the combinational circuitry properties required to meet our relevant requirements.SEM (scanning electron microscopy) anatomical assessments of aluminium, silicon carbide, and iron. The current inquiry examines the implications of the particle stages on the microhardness, elastic modulus, and mechanical and wear features of aluminium as the base material and silicon carbide as a reinforcement material for composites. The sample’s microhardness and modulus of elasticity improve from 64 to 70 and 688 MPa to 719 MPa, correspondingly, when the weight percentage of silicon carbide (micro %15 and nano%1, 2, 3, 4).

The various test results are examined in this investigation and made available for correlation with one another. The mechanical features and resistance to wear of aluminium matrix composites manufactured using several methods have been explored.